Patient Instructions: First-Void Urine needed - Patient should take first urine of the day to the lab or should not urinate for at least 1 hour prior to specimen collection. Fasting is not required. This test may exhibit interference when sample is collected from a person who is consuming a supplement with a high dose of biotin (also termed as vitamin B7 or B8, vitamin H or coenzyme R). It is recommended to stop biotin consumption at least 72 hours prior to the collection of specimen.